A display device includes a display unit including a plurality of emission areas, a plurality of touch electrodes that sense a touch, a plurality of code patterns formed in a preset code shape on partial areas of front surfaces of the plurality of touch electrodes, a plurality of tilt sensing patterns including a light absorbent disposed in an inner area or a peripheral area of each of the plurality of code patterns, and a main processor. The main processor receives detected image data corresponding to the plurality of tilt sensing patterns from a position input device, and determines arrangement direction information and tilt information of the position input device by comparing the detected image data with each other.
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2. The display device of claim 1, wherein the plurality of tilt sensing patterns are respectively disposed around each of the plurality of code patterns in a horizontal direction (−x-axis direction) of a first side and an upward direction (y-axis direction) of a second side of each of the plurality of code patterns, or are respectively disposed around each of the plurality of code patterns in horizontal directions (x-axis and −x-axis directions) of the first side and an opposing third side and upward and downward directions (y-axis and −y-axis directions) of the second side and an opposing fourth side of each of the plurality of code patterns, in a plan view.
This invention relates to a display device incorporating tilt sensing patterns for detecting the orientation or tilt of the device. The problem addressed is the need for accurate and reliable tilt detection in display devices, which is essential for applications such as augmented reality, gaming, or user interface adjustments based on device orientation. The display device includes a substrate with a plurality of code patterns and tilt sensing patterns. The tilt sensing patterns are arranged around each code pattern in specific configurations. In one configuration, the patterns are placed on one side in the horizontal direction (negative x-axis) and on an adjacent side in the upward direction (y-axis). In another configuration, the patterns are placed on both horizontal sides (positive and negative x-axis) and both vertical sides (positive and negative y-axis) of each code pattern. These arrangements allow for precise detection of tilt in multiple directions. The code patterns and tilt sensing patterns are electrically connected to a sensing circuit, which processes signals to determine the device's tilt angle. The patterns may be formed using conductive materials and are designed to ensure accurate sensing regardless of the device's orientation. This configuration enhances the reliability and responsiveness of tilt detection in display devices.
7. The display device of claim 5, wherein the main processor distinguishes a detected image of each of the first to fourth sensing patterns from the detected image data, and corrects a size of the detected image of each of the first to fourth sensing patterns by increasing or decreasing the size according to a distance between the display unit and the position input device.
A display device includes a display unit and a position input device for detecting user input. The device uses a sensing system with first to fourth sensing patterns to determine the position of the input device relative to the display. The main processor analyzes detected image data from the sensing system to identify each of the first to fourth sensing patterns. The processor then corrects the size of each detected pattern image by scaling it up or down based on the distance between the display unit and the position input device. This correction ensures accurate position detection regardless of variations in distance, improving input precision. The sensing patterns may be arranged in a specific configuration, such as a grid or array, to enhance detection accuracy. The system may also include a sub-processor to assist in processing the detected image data, reducing the load on the main processor. The display device may be part of a larger system, such as a touchscreen or interactive display, where precise input tracking is critical. The correction mechanism compensates for perspective distortion or scaling effects caused by changes in the input device's position relative to the display.
8. The display device of claim 1, wherein when detected images and light amount detected areas of the first to fourth sensing patterns detected at a first time are the same as the reference detected images and the reference detected areas, or are similar to the reference detected images and the reference detected areas within reference error ranges, the main processor determines an arrangement direction of the position input device as a front surface direction and a tilt of the position input device as being substantially perpendicular to the front surface direction.
A display device includes a touch-sensitive display screen with integrated sensing patterns for detecting the position and orientation of a position input device, such as a stylus. The device addresses the challenge of accurately determining the stylus's position and orientation relative to the display surface, which is critical for precise input tracking. The display screen incorporates first to fourth sensing patterns arranged in a specific configuration to detect both the stylus's position and its tilt angle. The device compares detected images and light amount data from these patterns against reference values to determine the stylus's orientation. If the detected data matches or falls within predefined error ranges of the reference data, the device concludes that the stylus is aligned perpendicular to the display surface, indicating a standard front-facing orientation. This ensures accurate input tracking by confirming the stylus's position and tilt relative to the screen. The system enhances precision in touch and stylus-based interactions by dynamically adjusting to the stylus's orientation, improving user experience in applications requiring fine control, such as drawing or handwriting recognition.
10. The display device of claim 9, wherein the main processor determines that a horizontal tilt of the position input device becomes greater or smaller as an area of the sensing pattern calculated as having the greatest light amount detected area becomes greater or smaller.
This invention relates to display devices with position input systems, particularly those using light-based sensing to detect the position and orientation of an input device. The problem addressed is accurately determining the tilt of a position input device, such as a stylus or pointer, relative to a display surface. Traditional methods may struggle with precise tilt detection, leading to inaccuracies in user interactions. The display device includes a main processor and a position input device that emits light detectable by a sensor array. The sensor array captures a sensing pattern formed by the emitted light, and the main processor analyzes this pattern to determine the device's position and tilt. Specifically, the processor calculates the area of the sensing pattern with the greatest detected light amount. As the horizontal tilt of the position input device increases or decreases, the size of this greatest light amount area changes proportionally. By monitoring these changes, the processor can accurately infer the device's tilt angle. This method improves input precision by dynamically adjusting to variations in tilt, enhancing user experience in applications requiring fine control, such as drawing or design software. The system may also include additional features like pressure sensitivity or multi-touch support, depending on the implementation. The invention ensures reliable tilt detection without requiring complex additional hardware, leveraging existing light-sensing capabilities for improved functionality.
14. The display device of claim 13, wherein when the first to fourth luminance values of the first to fourth sensing patterns detected at a first time are the same as the first to fourth reference luminance values or similar to the first to fourth reference luminance values within reference error ranges, the main processor determines an arrangement direction of the position input device as a front surface direction and a tilt of the position input device as being substantially perpendicular to the front surface direction.
A display device includes a touch-sensitive display screen and a position input device, such as a stylus, that interacts with the display screen. The device detects the position and orientation of the stylus using multiple sensing patterns on the display screen. Each sensing pattern generates a luminance value when the stylus is in proximity. The device compares these detected luminance values to reference luminance values or allows for minor deviations within predefined error ranges. If the detected luminance values match or closely align with the reference values, the device determines that the stylus is positioned perpendicular to the display screen's front surface. This ensures accurate detection of the stylus's orientation and position, improving touch input precision. The system may also include additional processing to adjust for environmental factors or stylus movement, ensuring consistent performance. The invention addresses the challenge of reliably detecting stylus orientation and position on touch-sensitive displays, enhancing user interaction accuracy.
16. The display device of claim 13, wherein the main processor determines that a horizontal tilt of the position input device becomes greater or smaller as a difference value between any one of the first to fourth reference luminance values and a highest luminance value among the first to fourth luminance values becomes greater or smaller.
A display device includes a main processor and a position input device for adjusting display settings. The device measures luminance at multiple reference points on the display screen, generating first to fourth luminance values. The main processor compares these values to a highest luminance value among them, calculating a difference value for each. The processor then determines the horizontal tilt of the position input device based on how these difference values change. If the difference between any reference luminance value and the highest luminance value increases, the tilt is adjusted in one direction; if it decreases, the tilt is adjusted in the opposite direction. This mechanism allows the device to dynamically adjust display settings, such as brightness or color balance, by detecting and responding to changes in luminance distribution across the screen. The system ensures uniform display quality by compensating for variations in luminance detected at different screen regions. The position input device may include a touch-sensitive surface or a physical control, and the main processor executes algorithms to interpret luminance data and adjust the device's settings accordingly. This approach improves display uniformity and user experience by automatically correcting luminance imbalances.
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September 9, 2022
April 16, 2024
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